/*
 * XAdES4j - A Java library for generation and verification of XAdES signatures.
 * Copyright (C) 2011 Luis Goncalves.
 * 
 * XAdES4j is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation; either version 3 of the License, or any later version.
 * 
 * XAdES4j is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
 * details.
 * 
 * You should have received a copy of the GNU Lesser General Public License along
 * with XAdES4j. If not, see <http://www.gnu.org/licenses/>.
 */

package xades4j.xml.marshalling.algorithms;

import java.util.Collections;
import java.util.List;
import java.util.Map;
import org.apache.xml.security.exceptions.XMLSecurityException;
import org.apache.xml.security.transforms.params.XPathContainer;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import xades4j.algorithms.XPathTransform;

/**
 * @author Luís
 */
final class XPathTransformParamsMarshaller implements AlgorithmParametersMarshaller<XPathTransform>
{
    @Override
    public List<Node> marshalParameters(XPathTransform alg, Document doc)
    {
        XPathContainer xpathContainer = new XPathContainer(doc);
        xpathContainer.setXPath(alg.getXPath());
                
        for(Map.Entry<String, String> ns : alg.getNamespaces().entrySet())
        {
            try 
            {
                xpathContainer.setXPathNamespaceContext(ns.getKey(), ns.getValue());
            }catch (XMLSecurityException ex) 
            {
                throw new IllegalArgumentException("Invalid namespaces for XPath query", ex);
            }
        }

        return Collections.singletonList((Node)xpathContainer.getElement());
    }
}
